Diagnostics of gyneacological diseases, especially epithelial ovarian cancer

ABSTRACT

The present disclosure relates to methods and a kit for diagnosing, prognosing and/or monitoring a gynaecological disease, especially epithelial ovarian cancer, on the basis of altered glycosylation pattern of CA125. More specifically, said altered glycosylation pattern relates to that recognizable by MGL.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Divisional of U.S. application Ser. No.15/577,631, filed on Nov. 28, 2017, which is the National Phase under 35U.S.C. § 371 of International Application No. PCT/FI2016/050490, filedon Jul. 4, 2016, which claims the benefit under 35 U.S.C. § 119(a) toPatent Application No. 20155531, filed in Finland on Jul. 3, 2015, allof which are hereby expressly incorporated by reference in theirentirety into the present application.

FIELD OF THE INVENTION

The present disclosure relates to the non-invasive diagnostics ofgynaecological diseases, especially epithelial ovarian cancer (EOC), onthe basis of altered glycosylation patter of CA125, and provides variousmethods of diagnosing, prognosing, or monitoring gynaecologicaldiseases, including EOC.

BACKGROUND OF THE INVENTION

Early cancer detection with sensitive and accurate biomarkers is a keyto successful cancer treatment. Such biomarkers are especially importantfor cancers, which remain asymptomatic until disseminated stage, whencurative response can rarely be achieved. Epithelial ovarian cancer(EOC) is a major health care problem as early detection with sufficientsensitivity and specificity is lacking. The 5-year survival rate forwomen diagnosed at the early stage is 90% whereas it is 20% if detectedduring late stage.

Human cancer antigen 125 (CA125), also known as mucin 16 or MUC16, is acomplex transmembrane glycoprotein and the most widely used biomarkerfor EOC. It plays an important role not only in the diagnosis of primaryepithelial ovarian cancer but also in the disease monitoring ofpostoperative women. The existing CA125 assays are double-determinantimmunoassays based on detection of two different CA125 protein epitopesby two different monoclonal antibodies.

However, CA125 lacks sensitivity and cancer-specificity, especially atthe early stages of EOC, owing to its elevated expression also in benigngynaecological conditions such as benign ovarian neoplasms andendometriosis, as well as in liver disease, and even during the normalovulatory cycle. Therefore, CA125 is not recommended for screening ofEOC.

During cancer progression, glycosylation patterns of many proteinschange. Thus, detecting cancer related glycosylation patterns couldoffer novel diagnostic approaches for achieving improved specificity intumor detection. Indeed, altered glycan composition has been reported inovarian carcinoma compared to normal ovarian tissue, and further,altered glycan structures have been reported in serum CA125 of patientswith EOC.

Chen et al. (J. Proteome Res., 2013, 12, 1408-1418) have reported thataberrant O-glycoforms of CA125 are present in serum from primary EOCpatients and can be detected with a sandwich immunoassay using anO-glycan specific monocional antibody and VVL (Vicia Villosa lectin).

Although glycoprofiling of known tumor markers, such as CA125, and theuse of a panel of different tumor markers seem to be promising forincreasing the sensitivity and specificity of ovarian cancer detectionthrough the elimination of many false positive results, there is stillneed for more specific markers which enable sufficient, easy-to-usediscrimination between benign diseases and early, curable epithelialovarian cancers.

BRIEF DESCRIPTION OF THE INVENTION

In one aspect, the present disclosure provides a method of determining agynaecological disease state in a subject. Said method comprises thesteps of:

assaying a sample obtained from said subject for the level of CA125which binds to macrophage galactose-type lectin (CA125MGL),

comparing the detected level of CA125MGL in said sample with that of acontrol sample or a predetermined threshold value, and

determining the gynaecological disease state in said subject on thebasis of said comparison.

In some embodiments, increased level of CA125^(MGL) indicates that saidsubject has or is at risk of having epithelial ovarian cancer (EOC),while non-increased level of CA125^(MGL) indicates that said subjectdoes not have or is not at risk of having EOC but may have or be at riskof having endometriosis or endometrial cancer, or may be apparentlyhealthy also with respect to endometriosis or endometrial cancer.

In some further embodiments, the method may further comprise assaying asample obtained from said subject for CA125 protein concentration, andcomparing the detected CA125 protein concentration with that of acontrol sample or a predetermined threshold value. Increased CA125protein concentration in combination with increased level of CA125^(MGL)would further indicate that said subject has or is at risk of havingEOC, while increased CA125 protein concentration in combination withnon-increased level of CA125^(MGL) would indicate that said subject hasor is at risk of having endometriosis.

Alternatively or in addition, the method may further comprise assaying asample obtained from said subject for the HE4 concentration, andcomparing the detected HE4 concentration with that of a control sampleor a predetermined threshold value. Increased HE4 concentration incombination with increased level of CA125^(MGL) would further indicatethat said subject has or is at risk of having EOC, while increased HE4concentration in combination with non-increased level of CA125^(MGL)would indicate that said subject has or is at risk of having endometrialcancer.

The present method may be used, for example, for differentialdiagnostics of a gynaecological disease selected from the groupconsisting of EOC, endometriosis, or endometrial cancer, or fordiagnosing, prognosing, or monitoring a gynaecological disease selectedfrom the group consisting of EOC, endometriosis, or endometrial cancer.In some embodiments said monitoring may encompass monitoring onset ofsaid gynaecological disease, for monitoring any change in risk of havingor developing said gynaecological disease, for monitoring response totreatment, for monitoring relapse of said gynaecological disease, or formonitoring recurrence of said gynaecological disease.

In some further embodiments, said assaying of the level of CA125^(MGL)may be carried out by assaying the level of CA125 binding to saidMGL-NP, which assaying may comprise capturing CA125 contained in thesample using a capturing agent, such as an anti-CA125 antibody ormesothelium, and measuring said captured CA125 for the level of bindingto MGL-NP with the aid of a detectable signal. In other words, saidsample is assayed for the amount of CA125^(MGL) by using a CA125 bindingagent and detectably labelled MGL-NP.

In some other embodiments, said assaying of the level of CA125^(MGL) maybe carried out by assaying the level of CA125 binding to said MGL-NP,which assaying may comprise subjecting said sample to MGL-NP in order tocapture MGL-binding glycoform of CA125 contained in the sample, andmeasuring the amount of captured CA125 using a CA125 binding agent, suchas an anti-CA125 antibody or mesothelium, with the aid of a detectablesignal. In other words, said sample is assayed for the amount ofCA125^(MGL) by using MGL-NP and a detectably labelled CA125 bindingagent.

In another aspect, the present disclosure provides a kit for use in anyof the methods disclosed herein. Said kit comprises a CA125-bindingagent, such as a monoclonal anti-CA125 antibody or mesothelium, and aMGL-NP. Either said CA125-binding agent or said MGL-NP comprises adetectable label. In some embodiments, either said CA125-binding agentor said MGL-NP is bound to a solid surface, such as a microtiter plate.

In a further aspect, the present disclosure provides a MGL-NP as setforth below. Said MGL-NP may be used, for example, in diagnosing,prognosing and/or monitoring a gynaecological disease state in asubject. Preferably, said gynaecological disease is selected from thegroup consisting of EOC, endometriosis and endometrial cancer.

Other objectives, aspects, embodiments, details and advantages of thepresent invention will become apparent from the following figures,detailed description, examples, and dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

In the following the invention will be described in greater detail bymeans of preferred embodiments with reference to the attached drawings,in which

FIG. 1 illustrates the principles of different CA125 assays of thepresent description. In a conventional CA125 immunoassay (FIG. 1A), boththe capturing agent and the tracer are monoclonal antibodies, whichdetect different protein epitopes of CA125. In an antibody-lectinsandwich assay (FIG. 1B), a CA125 protein epitope-specific antibody isused as the capturing agent, while a glycan-specific Eu³⁺-labelledlectin is used as the tracer. In an antibody-lectin nanopartide sandwichassay (FIG. 1C), a CA125 protein epitope-specific antibody is used asthe capturing agent, while a glycan-specific Eu³⁺-dopednanoparticle-labelled lectin is used as the tracer.

FIG. 2 shows the results of a conventional CA125 Immunoassay. CA125 fromprimary ovarian carcinoma cell line OVCAR-3 (OvCa-CA125), amniotic fluid(AF-CA125) and placental homogenate (Pla-CA125) were captured onbiotinylated Ov197 mAb. Eu³⁺ chelates-labelled Ov185 mAb was used as atracer. All origins of CA125 showed almost similar signals/backgroundratios indicating that equal amounts of CA125 were used regardless ofthe origin.

FIG. 3 illustrates the conventional CA125 immunoassay with fourdifferent CA125-containing samples, namely purified CA125 from a primaryovarian carcinoma cell line OVCAR-3 (OvCa-CA125), placental homogenate(Pla-CA125), ascites fluid of liver cirrhosis (LC-CA125) and immatureteratoma (IT-CA125). Different amounts of CA125 ranging from 5 to 2000U/ml (with the exception of IT-CA125 whose amount ranged from 5 to 1000U/ml) were captured on bioOv197 mAb and traced by Ov185-Eu³ mAb used astracer. Different samples could not be discriminated from each other.Only IT-CA125 showed deflection at higher concentration (500 to 1000U/ml) due to matrix effect as the concentration of CA125 in ascitesfluid of IT was only 904 U/ml.

FIG. 4 demonstrates that, with the exception of AAL, no discriminationbetween three different origins of CA125 was achieved when lectinslabelled with Europium N1 chelates were used as tracers. OVCAR-3 cellline was used as a source for cancerous CA125 (OvCa-CA125), whereasamniotic fluid and placental homogenate were used as sources for normalCA125 (AFCA125 and Pla-CA125, respectively). AAL was able todiscriminate amniotic fluid-derived CA125 from cancerous and placentalCA125. Note the high levels of background signals set forth in Table 3for each of the lectins in relation to the predominantly low specificsignals (Signal-background) shown on the y-axis.

FIG. 5 shows the results of anti-CA125 antibody-AAL lectin assay withfour clinical samples. CA125 from two EOC and two endometriosis serumsamples (EOC-1, EOC-2, Endo.1, and Endo.2, respectively) were capturedon bioOv197 mAb as well as on Fab2 fraction thereof, andEu³⁺chelates-labelled AAL lectin used as a tracer. No remarkablediscrimination between EOC and endometriosis patient samples wasachieved.

FIG. 6 shows the results of anti-CA125 antibody-lectin nanoparticleassay. CA125 from four different origins in amounts of either 5, 50, or100 U/ml in TSA-BSA buffer were captured on bio-Ov185 MAb. A panel ofplant and human lectins immobilized on Eu³⁺-nanoparticles were used astracers. Only MGL-NP clearly discriminated OvCa-derived CA125 from CA125of other origins. Background signals for each of the lectins are shownin Table 4.

FIG. 7 shows the results of anti-CA125 antibody-MGL nanoparticle assaywith different biotinylated capture antibodies (Ovk95, Ov185 and Ov197).Eu³⁺-labelled MGL-NP was used as a tracer. In each case, OvCa-CA125 wasdiscriminated almost 10-fold from Pla-CA125. The highest specificsignals were obtained when bioOv185 was used as the capturing antibody.

FIG. 8 shows the results of the MGL-NP assay in wider dynamic rangeswith four different origins of CA125. CA125 from primary OvCa cell lineOVCAR-3 (OvCa-125), placental homogenate (Pla-CA125), and ascites ofliver cirrhosis (LC-CA125) and immature teratoma (IT-CA125) were used inan amount of 5 to 2000 U/ml (with the exception of IT-CA125 withconcentrations ranging from 5 to 1000 U/ml). No hook effect was observedwith concentrations of CA125 even up to 2000 U/ml.

FIG. 9 shows the results of the MGL-NP assay with CA125 samples spikedin healthy pooled male plasma (HP) or in TSA-BSA 1% buffer (TB).Specific signals were almost similar with simple matrices like TSA-BSA1% and using healthy pooled male plasma.

FIG. 10 shows the ratios of specific signals obtained with the presentMGL-NP assay and the conventional CA125 immunoassay. EOC serum samples(1-6) showed elevated signals as compared with serum samples of pregnantwomen (7-8) and two pools of endometriosis samples (9-10). Thus, theMGL-NP assay is able to distinguish EOC-related CA125 from normal orbenign CA125.

FIG. 11A shows a Box Plot presentation of a conventional HE4 immunoassaywith five different groups of clinical serum samples (healthy women ascontrols n=51, endometriosis stages 1-2 n=33, endometriosis stages 3-4n=88, EOC progression/relapse cases n=43 (OvCa progression) andendometrial cancer n=16 (EmCa)). Median of each group is shown withinthe boxes.

FIG. 11B shows a Box Plot presentation of a conventional CA125immunoassay with five different groups of clinical serum samples(healthy women as controls n=51, endometriosis stages 1-2 n=33,endometriosis stages 3-4 n=88, EOC progression/relapse cases n=43 (OvCaprogression) and endometrial cancer n=16 (EmCa)). Median of each groupis shown within the boxes.

FIG. 11C shows a Box Plot presentation of the MGL-NP assay with fivedifferent groups of clinical serum samples (healthy women as controlsn=51, endometriosis stage 1-2 n=33, endometriosis stage 3-4 n=88, EOCprogression/relapse cases n=43 (OvCa progression), and endometrialcancer n=16 (EmCa)). Median of EOC is 6 while medians of all othergroups are only 1.

FIGS. 12A to 12D show Box Plot presentations which demonstratediscrimination of EOC from benign endometriosis and healthy controlsusing conventional CA125 immunoassay (FIGS. 12A and 12C) andCA125^(MGL)-assay (FIGS. 12B and 12D). FIG. 12 shows that CA125 inpreoperative high-grade serous EOC (n=21) and endometriosis (n=121) weresignificantly higher than in healthy controls (n=51) with conventionalCA125 immunoassay (p<0.001). FIG. 12B shows that no significantdifference between endometriosis and healthy controls was observed inCA125^(MGL) levels while preoperative EOC levels were significantlyhigher (p<0.001). FIG. 12C shows that EOC (n=38) and endometriosis(n=44) samples with marginally elevated CA125 concentrations (35-200U/ml), which are clinically the most challenging for diagnostics, didnot differ with CA125 immunoassay, while FIG. 12D shows that CA125^(MGL)levels remained significantly different.

FIG. 13A shows ROC curves for HE4, CA125, and CA125^(MGL) either aloneor in combination in a cohort of all sequential EOC cases (n=213) vs.endometriosis cases (n=133). The highest AUC value was obtained with acombination of all three markers.

FIG. 13B shows ROC curves for HE4, CA125, and CA125^(MGL) either aloneor in combination in a cohort of progression/relapse cases of EOC (n=43)vs. endometriosis (n=133). The highest AUC value was obtained with acombination of all three markers.

FIG. 13C shows ROC curves for HE4, CA125, and CA125^(MGL) either aloneor in combination in a cohort of pre-treatment EOC cases (n=29) vs.endometriosis (n=133). All markers show high AUC values but the highestAUC value was obtained with a combination of all three markers.

FIG. 14 demonstrates that the present MGL-NP assay shows earlier andstronger relative temporal changes than HE4 and CA125 immunoassays. Eachpanel represents a different patient and shows relative concentrationsof HE4, CA125, and CA125^(MGL) overtime.

FIGS. 15A to 15C demonstrate that hormonal status does not have anyeffect on serum levels of CA125^(MGL) and HE4. Boxes represent healthycontrols or patients with endometriosis at different stages of themensuration cycle as indicated. The horizontal broken line shows thecut-off value for the marker in question. Box Plots for CA125 and HE4were adapted from Hallamaa et al. (Gynecol. Oncol., 2012, 125: 667-672).Abbreviations: prol, prolif, proliferative; secr, secretory; endo,endometriosis; IA, immunoassay.

DETAILED DESCRIPTION OF THE INVENTION

The present disclosure is based on studies aiming to distinguishepithelial ovarian cancer (EOC)-related CA125 from other CA125 specieson the basis of CA125 glycosylation pattern. In accordance with thisaim, the present disclosure provides means and methods of determining agynaecological disease state in a subject who is suspected to sufferfrom or be at risk of suffering from said gynaecological disease,especially for diagnosing, prognosing, or monitoring a gynaecologicaldisease, particularly a gynaecological disease selected from the groupconsisting of EOC, endometriosis, and endometrial cancer.

As used herein, the term “or” has the meaning of both “and” and “or”(i.e. “and/or”). Furthermore, the meaning of a singular noun includesthat of a plural noun and thus a singular term, unless otherwisespecified, may also carry the meaning of its plural form. In otherwords, the term “a” or “an” may mean one or more.

As used herein, the term “subject” refers to an animal, preferably to amammal, more preferably to a human, and most preferably to a female.Depending on an embodiment in question, said subject may suffer from agynaecological disease with or without diagnosis, be suspected to sufferfrom a gynaecological disease, be at risk of said gynaecologicaldisease, or may have already been treated for a gynaecological disease.In some preferred embodiments, said gynaecological disease is selectedfrom the group consisting of EOC, endometriosis, and endometrial cancer.In some more preferred embodiments, said gynaecological disease is EOC.Herein, the terms “human subject”, “patient” and “individual” areinterchangeable.

As used herein, the term “sample” refers to a tissue sample, such as abiopsy sample taken from an ovary or endometrium, and to a sample of abodily fluid, such as ascites fluid, urine, blood, plasma, serum, andperitoneal cavity fluid, obtained from a subject. In some embodiments,said tissue sample may be a formalin-fixed or paraffin-embedded tissuesample. Generally, obtaining the sample to be analysed from a subject isnot part of the present method of determining a subject's gynaecologicaldisease state. A blood, serum or plasma sample is the most preferredsample type to be used in the present method and its all embodiments.

In embodiments which concern assessment of the level of more than onebiomarker, same or different samples obtained from a subject whosegynaecological disease state is to be determined may be used for eachassessment. Said different samples may be of the same or different type.

As used herein, the term “level” is interchangeable with the terms“amount” and “concentration”, unless otherwise indicated.

To determine whether a detected level of a biomarker is indicative ofthe presence or risk of a disease associated with said biomarker, itslevel in a relevant control has to be determined. Once the controllevels are known, the determined marker levels can be compared therewithand the significance of the difference can be assessed using standardstatistical methods. In some embodiments, a statistically significantdifference between the determined biomarker level and the control levelis indicative of the disease in question. In some further embodiments,before to be compared with the control, the biomarker levels arenormalized using standard methods.

As used herein, the term “control” may refer to a control sampleobtained from an apparently healthy individual or pool of apparentlyhealthy individuals, or it may refer to a predetermined threshold value,i.e. a cut-off value, which is indicative of the presence or absence ofthe disease in question. Statistical methods for determining appropriatethreshold values will be readily apparent to those of ordinary skill inthe art. The threshold values may have been determined, if necessary,from samples of subjects of the same age, demographic features, and/ordisease status, etc. The threshold value may originate from a singleindividual not affected by the disease in question or be a value pooledfrom more than one such individual. Non-limiting examples of suitablepredetermined threshold values include, but are not limited to, 35 U/mlfor CA125, and 70 pM for HE4, as is generally accepted.

In the cohorts studied in the experimental part, almost 90% of healthywomen showed a CA125^(MGL) concentration below 2 U/ml, while only 4among 51 healthy women tested showed a CA125^(MGL) concentration >2U/ml. Thus, in some embodiments the predetermined threshold value forCA125^(MGL) may be from about 2 U/ml to about 3 U/ml, e.g. about 2 U/mlor about 2.8 U/ml. However, depending on the desired sensitivity andspecificity, other predetermined threshold values for CA125^(MGL) may beused. Non-limiting examples of such other threshold values include anyvalues falling within ranges from about 2 U/ml to about 7 U/ml, fromabout 2 U/ml to about 6 U/ml, from about 2 U/ml to about 5 U/ml, andfrom about 2 U/ml to about 4 U/ml. For screening purposes and other useswhere the clinical sensitivity of the assay needs be maximized,threshold values as low as about 0.5 to 2 U/ml, e.g. about 1 U/ml or 1.5U/ml, may also be used. On the other hand, in diagnostic or otherembodiments where the clinical specificity of the assay needs bemaximized, threshold values as high as about 5 to 20 U/ml, e.g. about 10U/ml or 15 U/ml, may also be used. However, these ranges may also varydepending on the specifics of the detection technique or means toprovide MGL in high enough avidity into the assay.

In some embodiments, the term “control sample” refers to a sampleobtained from the same subject whose gynaecological disease state is tobe determined but obtained at a time point different from the time pointof the disease state determination. Non-limiting examples of suchdifferent time points include one or more time points before diagnosisof the disease, one or more time points after diagnosis of the disease,one or more time points before treatment of the disease, one or moretime points during treatment of the disease, and one or more time pointsafter treatment of the disease. Typically, such control samples obtainedfrom the same subject are used when the purpose of the gynaecologicaldisease state determination is to monitor said disease, especially tomonitor the onset of the disease, or risk development of the disease,response to treatment, relapse of the disease, or recurrence of thedisease.

As used herein, the term “apparently healthy” refers to an individual ora pool of individuals who show no signs of a disease in question andthus are believed not to be affected by said disease in question or whoare predicted not to develop said disease in question.

As used herein, the term “indicative of a disease”, when applied to abiomarker, refers to a level which, using routine statistical methodssetting confidence levels at a minimum of 95%, is diagnostic of saiddisease or a stage of said disease such that the detected level is foundsignificantly more often in subjects with said disease or a stage ofsaid disease than in subjects without said disease or another stage ofsaid disease. Preferably, the level which is indicative of a disease isfound in at least 80% of subjects who have the disease and is found inless than 10% of subjects who do not have the disease. More preferably,the level which is indicative of said disease is found in at least 90%,at least 95%, at least 98%, or more in subjects who have the disease andis found in less than 10%, less than 8%, less than 5%, less than 2.5%,or less than 1% of subjects who do not have the disease.

Existing CA125 immunoassays routinely used diagnostically are based onthe determination of CA125 protein levels in serum or plasma by twodifferent monoclonal antibodies which recognize different proteinepitopes of CA125. Such conventional immunoassays, herein referred to as“assaying a sample for CA125 protein concentration”, are commerciallyavailable from several different providers. Accordingly, the term“CA125” refers to the protein component of CA125 irrespective of itsglycosylation pattern. In general, a CA125 serum concentration of 35U/ml or below is considered normal. However, CA125 concentrations abovethis cut-off level are frequently found in patients with conditionsother than ovarian cancer such as endometriosis, which causes falsepositive results in EOC diagnostics.

In accordance with this generally accepted flaw of CA125 immunoassays,no discrimination between epithelial ovarian cancer-related CA125 andnormal or benign CA125 derived from placental homogenates, amnioticfluid, liver cirrhotic ascites or immature teratoma-related ascites wasachieved herein as described in more detail in Example 2.

CA125 is a heavily glycosylated molecule with abundant N-linked andO-linked glycan side chains and an overall carbohydrate content of 24%to 28%. Lectins, i.e. members of a well-known family ofcarbohydrate-binding proteins that are highly specific for given glycanson the basis of their sugar moiety structures and sequences, have beensuggested for identifying changes in the glycosylation of cancer cellsand tissues.

Therefore, a panel of plant and human lectins was used in an anti-CA125antibody-lectin sandwich assay described in more detail in Example 3.According to the results, none of the lectins employed was able todiscriminate between normal CA125 derived from amniotic fluid or normalplacenta and ovarian cancer-related CA125 derived from a primary ovariancarcinoma cell line called OVCAR-3.

Unexpectedly, however, excellent discrimination between EOC-related andnon-EOC-related CA125 was achieved with macrophage galactose-type lectin(MGL) when it was immobilized on a nanoparticle. As demonstrated inExample 3, the present method discriminates EOC-related CA125 fromnormal/benign CA125 with a minimum of 10-fold preference over placentalCA125. The ability of the present method to distinguish EOC-relatedCA125 from pregnancy-related or endometriosis-related CA125 was verifiedwith clinical serum samples. These results are not limited to the use ofMGL when immobilized on a nanoparticle but apply to embodiments, whereinadequate avidity effect and signal amplification are obtained by othertechniques.

As used herein, the term “CA125^(MGL)” refers to a glycoform of CA125,which binds to MGL, such as nanoparticle-immobilized MGL (MGL-NP),specifically.

As used herein, the term “MGL” refers to an isolated human macrophagegalactose-type lectin, which is a C-type lectin receptor (CLR) that isnaturally present on our immune cells, more specifically dendritic cellsand macrophages. The human MGL has an exclusive specificity for rareterminal GalNAc structures, which are revealed on tumor-associated mucinMUC1. The term “MGL” also encompasses MGL fused at the C-terminus tohuman IgG1-Fc (MGL-Fc) according to standard methods known in the art.Such MGL-Fc is commercially available. MGL is also known by the namesCD301, and C-type lectin domain family 10 member A (CLEC 10A).Recombinant human CLECI OA without any Fc fusion is commerciallyavailable.

In accordance with the above, the present invention provides a method ofdetermining a gynaecological disease state in a subject by assaying asample obtained from said subject for CA125^(MGL). Increased level ofCA125^(MGL) in said sample as compared with that of a control sample ora predetermined threshold value is indicative that said subject has oris at risk of having EOC. On the other hand, non-increased or normallevel of CA125^(MGL) in said sample as compared with that of a controlsample or a predetermined threshold value is indicative that saidsubject is apparently healthy with respect to EOC or is not at risk ofhaving or developing EOC. In some embodiments said method may be amethod of determining EOC disease state in a subject. In some furtherembodiments said method may be a method of diagnosing, prognosing, ormonitoring EOC, wherein monitoring EOC encompasses, but is not limitedto, monitoring onset of EOC, monitoring any development in risk of EOC,monitoring response to treatment, monitoring relapse of EOC, andmonitoring recurrence of EOC.

However, non-increased or normal level of CA125^(MGL) as a test resultdoes not exclude the possibility that the subject whose gynaecologicaldisease state is to be determined may suffer from or be at risk ofhaving a gynaecological disease other than EOC, such as endometriosis orendometrial cancer. On the other, a subject with such a test result mayalso be apparently healthy with respect not only to EOC, but also toendometriosis and endometrial cancer. Thus, if the purpose of thepresent method is not only determine a subject's EOC state but todetermine a subject's disease state also with respect to othergynaecological diseases such as endometriosis or endometrial cancer, andif level of CA125^(MGL) is non-increased in said sample, furtherdiagnostic testing may be warranted to determine the risk of saidsubject having a gynaecological disease other than EOC. As set forthbelow, such further testing may comprise assaying a sample obtained fromsaid subject also for CA125 and/or HE4 in order to determine the risk ofsaid subject having endometriosis or endometrial cancer. Alternativelyor in addition, said further testing may also include use of anyappropriate diagnostic methods available in the art.

In some embodiments, the method of determining a gynaecological diseasestate in a subject may be used for differential diagnostics between EOCand endometriosis or endometrial cancer.

As indicated above, the level of CA125^(MGL) in a sample may in someembodiment be quantified or assayed by determining the level of CA125binding to nanoparticde-immobilized MGL (MGL-NP), for instance by usingany assay format exemplified herein. Although the present disclosurefocuses on MGL-NP-based assays, other techniques for determining thelevel of CA125^(MGL) in sample are envisaged as well. In other words,nanoparticles are only one preferred way of providing adequate avidityeffect and signal amplification for carrying out the present method andits various embodiments.

As used herein, the term “nanopartide” (NP) refers to a particle,synthetic or natural, having one or more dimensions, e.g. a diameter, ofless than about 1000 nm, e.g. about 500 nm or less, about 100 nm orless, or about 50 nm or less. As used herein, the term “about” refers toa range of values ±10% of a specified value. For example, the phrase“about 100 nm” includes ±10% of 100 nm, or from 90 nm to 110 nm. Thenanoparticles may generally have a spherical shape but alsonon-spherical shapes such as ellipsoidal shapes can be used. In someembodiments, all the dimensions of said nanopartide are less than about1000 nm, about 500 nm or less, about 100 nm or less, or about 50 nm orless.

A variety of different materials may be utilized in the presentnanoparticles. Non-limiting examples of suitable polymers includepoly(ethylene glycol) (PEG), polystyrene, polyethylene, poly(acrylicacid), poly(methyl methacrylate) (PMMA), polysaccharides, and copolymersor combinations thereof. Other suitable nanoparticle materials include,but are not limited to, colloidal gold, silver, quantum dots, carbon,porous silicon, and liposomes. Further suitable nanoparticle materialsinclude protein nanoparticles, mineral nanoparticles, glassnanoparticles, nanoparticle crystals, metal nanoparticles, and plasticnanoparticles.

Nanoparticles suitable for use in the present method may be directly orindirectly qualitatively or quantitatively detectable by any knownmeans. For instance, the nanoparticles may be detectable owing to aninherent quality as in the case of e.g. upconverting nanoparticles(UCNP), resonance particles, quantum dots, and gold particles. In someother embodiments, the nanoparticles can be made detectable e.g. byfluorescent labels, bioluminescent labels, chemiluminescent labels. Insome further embodiments, labelling or doping with lanthanides, i.e.luminescent lanthanide ions with luminescence emission in visible ornear-infrared or infrared wavelengths and long fluorescence decay, suchas europium (III), terbium (III), samarium (III), dysprosium (III),ytterbium (III), erbium (III) and neodynium (III), are preferred meansfor making the present nanoparticles detectable.

In some non-limiting embodiments, the most preferred nanoparticles arepolystyrene nanoparticles having a diameter of either 97 nm or 107 nm.Such nanoparticles are commercially available at least from ThermoScientific Seradyn Inc.

MGL may be immobilized on nanoparticles by any suitable method known inthe art, including but not limited to that disclosed in Example 1.Herein, nanoparticle-immobilized MGL is called MGL-NP for short.

Binding of CA125 to MGL-NP may be determined by various ways. In someembodiments, said binding is determined by a sandwich assay wherein aCA125-specific monoclonal antibody is used as a capturing agent andMGL-NP as a tracer. In some other embodiments, the sandwich assay may beconducted using a reversed way. In such cases, MGL-NP is used as acapturing agent and a CA125-specific monoclonal antibody as a tracer.Since urine contains less interfering glycosylated molecules than blood,the reversed sandwich assay may operate better with urine samples thanwith blood samples.

In some further embodiments of the present MGL-NP assay, mesothelin, aglycosylphosphatidylinositol-linked glycoprotein, may be used instead ofa CA125-specific monoclonal antibody either as a capturing agent or as atracer.

Sandwich assays according to various embodiments of the presentinvention may be performed either on a solid surface, such as amicrotiter plate, or in lateral flow format. Means and methods forbinding a capturing agent to a solid surface, e.g. via astreptavidin-biotin complex, or incorporating a capturing agent to alateral flow assay are known in the art and readily apparent to askilled person. Any tracer may have been labelled with a detectablelabel such as a lanthanide chelate selected from europium(III),terbium(III), samarium(III), and dysprosium(III). In some specificembodiments, europium chelate is used as a detectable label. In anon-limiting preferred embodiment, MGL-NP is used as a tracer and isdoped with 30000 Eu-chelates. In some other specific embodiments, MGL isattached on upconverting phosphorus (UCP) particles, which areparticularly suitable for use as tracers in the lateral flow format.

Any monoclonal anti-CA125 antibody may be used in the abovementionedsandwich assays. Non-limiting examples of suitable commercial anti-CA125antibodies include Ov185, Ov197, and OvK95, available at least fromFujirebio Diagnostics, Sweden. Further CA125-specific monoclonalantibodies may be produced according to methods well known in the art.

Suitable substrates for use in the present MGL-NP assay include, but arenot limited to, glass, silica, aluminosilicates, borosilicates, metaloxides such as alumina and nickel oxide, gold, various days,nitrocellulose or nylon. In some embodiments, the substrate may becoated with a compound to enhance binding of the anti-CA125 antibody tothe substrate. In some further embodiments, one or more controlantibodies are also attached to the substrate.

Receiver Operating Characteristic (ROC) curves may be utilized todemonstrate the trade-off between the sensitivity and specificity of amarker, as is well known to skilled persons. The sensitivity is ameasure of the ability of the marker to detect the disease, and thespecificity is a measure of the ability of the marker to detect theabsence of the disease. The horizontal X-axis of the ROC curverepresents 1-specificity, which increases with the rate of falsepositives. The vertical Y-axis of the curve represents sensitivity,which increases with the rate of true positives. Thus, for a particularcut-off selected, the values of specificity and sensitivity may bedetermined. In other words, data points on the ROC curves represent theproportion of true-positive and false-positive classifications atvarious decision boundaries. Optimum results are obtained as thetrue-positive proportion approaches 1.0 and the false-positiveproportion approaches 0.0. However, as the cut-off is changed toincrease specificity, sensitivity usually is reduced and vice versa.

As used herein, the term “false positive” refers to a test result, whichclassifies an unaffected subject incorrectly as an affected subject.Likewise, “false negative” refers to a test result, which classifies anaffected subject incorrectly as an unaffected subject.

As used herein, the term “true positive” refers to a test result, whichclassifies a subject who has a disease correctly as an affected subject.Likewise, “true negative” refers to a test result, which classifies anunaffected subject correctly as an unaffected.

In accordance with the above, the term “success rate” refers to thepercentage-expressed proportion of affected individuals with a positiveresult, while the term “false positive rate” refers to thepercentage-expressed proportion of unaffected individuals with apositive result.

The area under the ROC curve, often referred to as the AUC, is a measureof the utility of a marker in the correct identification of diseasesubjects. Thus, the AUC can be used to determine the effectiveness ofthe test. An area of 1 represents a perfect test; an area of 0.5represents a worthless test. A traditional rough guide for classifyingthe accuracy of a diagnostic or predictive test is the following: AUCvalues 0.9 to 1 represent test with excellent diagnostic or prognosticpower, AUC values 0.80 to 0.90 represent a test with good diagnostic orprognostic power, AUC values 0.70 to 0.80 represent a test with fairdiagnostic or prognostic power, AUC values 0.60 to 0.70 represent a testwith poor diagnostic or prognostic power, and AUC values 0.50 to 0.60represent a test with failed diagnostic or prognostic power.

As shown in the experimental part, depending on the EOC patient groupemployed (all 213 EOC cases, 43 cases representing early stages of EOC,or 29 cases representing advanced stages of EOC), present MGL-NP assaywas able to distinguish EOC from endometriosis with AUC values of 0.815,0.870 or 0.899. The success rate of the present MGL-NP assay in theclinical cohort representing early progression/relapse stages of EOC was71.9%.

The above values were improved when the MGL-NP assay was combined withthe conventional CA125 immunoassay, which determines the overall serumconcentration of CA125 protein irrespective of its glycoformcomposition. The success rate of the combined determination ofCA125^(MGL) and CA125 in the clinical cohort representing early stagesof EOC was improved to 81.2%. Thus, in some embodiments, the presentmethod of determining a subject's gynaecological disease state maycomprise determination of levels of both CA125^(MGL) and CA125 in asample obtained from said subject, preferably in a blood sample, morepreferably in serum or plasma. Such a combined determination would atleast in some cases improve the accuracy of the test result or confirmit.

Combined determination of the level of both CA125^(MGL) and CA125 isparticularly useful for distinguishing subjects having or being at riskof EOC and subjects having or being at risk of endometriosis from eachother, i.e. for differential diagnostics of between EOC andendometriosis. This is at least partly because while having excellentability to detect EOC-related CA125, CA125^(MGL) does not distinguishapparently healthy subjects from those suffering from endometriosis,because CA125^(MGL) concentration is not increased in samples obtainedfrom subjects with endometriosis. In other words, normal ornon-increased level of CA125^(MGL) does not tell whether the subject isapparently healthy with respect to endometriosis or has or is at risk ofhaving endometriosis. CA125 protein concentration, in turn, typicallyincreases both in EOC and endometriosis. Thus, increased concentrationof both CA125^(MGL) and CA125 is indicative of the presence or risk ofEOC, while non-increased level of CA125^(MGL) with concomitantlyincreased CA125 protein concentration is indicative of the presence orrisk of endometriosis. On the other hand, non-increased concentration ofboth CA125^(MGL) and CA125 is indicative of the presence or risk ofneither EOC nor endometriosis.

Accordingly, in some embodiments, the present method of determining agynaecological disease state may be a method of determining EOC diseasestate in a subject, such as a method of diagnosing, prognosing, ormonitoring EOC in a subject, wherein the method comprises assaying asample obtained from said sample for CA125^(MGL), and assaying the sameor a different sample obtained from said subject for CA125 proteinconcentration. In such a method, increased level of CA125^(MGL) incombination with increased CA125 protein concentration would beindicative that said subject has or is at risk of having EOC. On theother hand, non-increased or normal level of CA125^(MGL) in combinationwith non-increased or normal CA125 protein concentration would beindicative that said subject does not have or is not at risk of havingEOC, i.e. is apparently healthy with respect to EOC.

In some other embodiments, the method may be a method of determiningendometriosis disease state in subject, such as a method of diagnosing,prognosing or monitoring endometriosis, wherein the method comprisesassaying a sample obtained from said sample for CA125^(MGL), andassaying the same or a different sample obtained from said subject forCA125 protein concentration. In such a method, non-increased level ofCA125^(MGL) in combination with increased CA125 protein concentrationwould be indicative that said subject has or is at risk of havingendometriosis. On the other hand, non-increased level of CA125^(MGL) incombination with non-increased CA125 protein concentration would beindicative that said subject does not have or is not at risk of havingendometriosis, i.e. is apparently healthy with respect to endometriosis.

As shown in the experimental part, the performance of the MGL-NP assayfor distinguishing subjects with EOC from subjects with endometriosis,was also improved by a combined use with a conventional HE4 immunoassay.HE4 (human epididymis protein 4) is a known serum biomarker, which isoverexpressed in both ovarian and endometrial cancers. The success rateof the combined determination of CA125^(MGL) and HE4 in the clinicalcohort representing early stages of EOC was improved to 93.7%. Thus, insome embodiments, the present method of determining a subject'sgynaecological disease state may comprise determination of levels ofboth CA125^(MGL) and HE4, preferably in blood, more preferably in serumor plasma. In any of the embodiments of the present method which involveHE4 measurements, suitable predetermined threshold values for comparingwith the detected HE4 concentration include, but are not limited to, 70pM, especially for pre-menopausal subjects or subjects under the age of50, and 90 pM or 140-150 pM, especially for postmenopausal subjects orsubjects above the age of 50.

Accordingly, in some embodiments, determination of serum levels of bothCA125^(MGL) and HE4 may be used for determining EOC disease state in asubject, more specifically for diagnosing, prognosing or monitoring EOCin said subject. In such a method, increased concentration of bothCA125^(MGL) and HE4 would be indicative of the presence or risk of EOC,while non-increased concentration of both CA125^(MGL) and HE4 wouldindicate that said subject does not have or is not at risk of havingEOC, i.e. is apparently healthy with respect to EOC.

In some other embodiments, determination of serum levels of bothCA125^(MGL) and HE4 may be used for differential diagnostics of EOC andendometrial cancer. In such a method, increased concentration of bothCA125^(MGL) and HE4 would be indicative of the presence or risk of EOC,while non-increased concentration of CA125^(MGL) with concomitantlyincreased concentration of HE4 would be indicative of the presence orrisk of endometrial cancer.

In some further embodiments, determination of serum levels of bothCA125^(MGL) and HE4 may be used for determining endometrial cancerdisease state in a subject, more specifically for diagnosing, prognosingor monitoring endometrial cancer in said subject. In such a method,non-increased concentration of CA125^(MGL) with concomitant increase inHE4 concentration would indicate that said subject has or is at risk ofendometrial cancer, while non-increased concentration of bothCA125^(MGL) and HE4 subject would indicate that said subject does nothave or is not at risk of having endometrial cancer, i.e. is apparentlyhealthy with respect to endometrial cancer.

In some further embodiments, CA125^(MGL), CA125, and HE4 may all be usedin combination for determining a subject's a gynaecological diseasestate, especially concerning a disease selected from EOC, endometriosis,and endometrial cancer, for differential diagnostics between EOC,endometriosis and endometrial cancer, and for any diagnostic, prognosticand/or monitoring purpose concerning EOC, endometriosis and endometrialcancer.

As shown in the Examples below, the combined use of the three biomarkersprovided an excellent discrimination of EOC from endometriosis. To bemore specific, AUC values of 0.899, 0.947, and 0.967 were obtained inthe group of non-categorized EOC samples (n=213), the group of serumsamples representing early stages of EOC (n=43) and the group of serumsamples representing advanced stages of EOC (n=29), respectively. Thus,in some embodiments provided is a method of determining a subject's EOCdisease state, such as a method of diagnosing, prognosing, or monitoringEOC in said subject, by assaying same or different samples forconcentrations of CA125^(MGL), CA125, and HE4 in said sample. In suchmethods, concomitantly increased concentration of CA125^(MGL), CA125,and HE4 would be indicative of said subject having or being at risk ofhaving EOC. On the other hand, concomitantly non-increasedconcentrations of CA125^(MGL), CA125, and HE4 would be indicative ofsaid subject not having or not being at risk of having EOC.

In some further embodiments provided is a method of determining asubject's endometriosis state, such as a method of diagnosing,prognosing, or monitoring endometriosis in said subject, by assayingsame or different samples for concentrations of CA125^(MGL), CA125, andHE4 in said sample. In such methods, increased concentration of CA125 incombination with concomitantly non-increased concentration ofCA125^(MGL) and HE4 would be indicative of said subject having or beingat risk of having endometriosis. On the other hand, concomitantlynon-increased concentrations of CA125^(MGL), CA125, and HE4 would beindicative of said subject not having or not being at risk of havingendometriosis.

In some still further embodiments provided is a method of determining asubject's endometrial cancer state, such as a method of diagnosing,prognosing, or monitoring endometrial cancer in said subject, byassaying same or different samples for concentrations of CA125^(MGL),CA125, and HE4 in said sample. In such methods, increased concentrationof HE4 in combination with concomitantly non-increased concentration ofCA125^(MGL) and CA125 would be indicative of said subject having orbeing at risk of having endometriosis. On the other hand, concomitantlynon-increased concentrations of CA125^(MGL), CA125, and HE4 would beindicative of said subject not having or not being at risk of havingendometrial cancer.

Furthermore, various embodiments of the present method may be used fordifferential diagnostics between gynaecological diseases selected fromthe group consisting of EOC, endometriosis, and endometrial cancer, andother diseases associated with abdominal pain including, but not limitedto, colon cancer, ulcerative colitis, irritable bowel disease, irritablebowel syndrome and Crohn's disease.

As set forth above, the present method is in some embodiments directedto diagnosing of a gynaecological disease, including EOC, endometriosis,and endometrial cancer, i.e. determining whether or not a subject has oris at risk of said gynaecological disease. This is also meant to includeinstances where the presence or the risk of the gynaecological diseaseis not finally determined but that further diagnostic testing iswarranted. In such embodiments, the method is not by itselfdeterminative of the presence or absence, or of the risk of thegynaecological disease in the subject but can indicate that furtherdiagnostic testing is needed or would be beneficial. Therefore, thepresent method may be combined with one or more other diagnostic methodsfor the final determination of the presence or absence, or of the riskof the gynaecological disease in the subject. Such other diagnosticmethods are well known to a person skilled in the art.

Being non-invasive and suitable for analysing serum samples, the presentmethod and its various embodiments may be easily incorporated into apopulation screening protocol to identify subjects having or being atrisk of having or developing EOC, endometriosis, or endometrial cancer.This would enable not only early diagnosis of EOC, endometriosis, orendometrial cancer, but also active surveillance for the onset of EOC,endometriosis, or endometrial cancer in subjects with identifiedincreased risk of developing EOC, endometriosis, or endometrial cancerlater in life. Moreover, early detection of EOC, endometriosis, orendometrial cancer would allow treating the disease early when chancesof cure are at their highest.

The present method and its various embodiments may be used not only fordiagnostic purposes but also for prognosis or predicting the outcome ofa gynaecological disease, including EOC, endometriosis, and endometrialcancer, or monitoring the subject's recovery or survival from saidgynaecological disease, any possible relapse or recurrence of thedisease or response to treatment. In some embodiments, the methodcomprises monitoring said gynaecological disease state of said subjectby comparing the levels of CA125 binding to said MGL-NP or the amount ofCA125^(MGL), with or without concomitantly comparing the levels of oneor both of HE4 and CA125, at different time points after diagnosis ofthe gynaecological disease in question and/or before, during, and aftertherapeutic intervention, e.g. by surgery, radiation therapy,chemotherapy, any other suitable therapeutic treatment, or anycombination thereof, to relieve or cure the gynaecological disease inquestion. In some other embodiments, the method comprises determiningsaid subject as having relapse or recurrence of EOC or as being at riskof relapse or recurrence of EOC, if the level of CA125 binding to saidMGL-NP or the amount of CA125^(MGL) is higher than in a control or abovea predetermined threshold value.

In some embodiments, diagnosing, prognosing and/or monitoring EOC, asset forth herein, are all encompassed by the expression “determining anEOC disease state”, be it de novo or recurrent appearance or suspicionof EOC. Thus, the present method may be formulated as a method ofdetermining an EOC disease status in a subject suspected of sufferingfrom EOC, comprising assaying the level of CA125 which binds to MGL-NPor the level of CA125^(MGL) in a sample obtained from said subject, anddetermining the EOC disease status in said subject on the basis of saidlevel of CA125 which binds to MGL-NP or said level of CA125^(MGL). Inother words, the method of diagnosing, prognosing, and/or monitoring EOCin a subject suspected of suffering from or being at risk of EOC, maycomprise assaying the level of CA125 which binds to MGL-NP or the levelof CA125^(MGL) in a sample obtained from said subject, and diagnosing,prognosing, and/or monitoring EOC in said subject on the basis of saidlevel of CA125 which binds to MGL-NP or said level of CA125^(MGL). Insuch methods, increased level of CA125 which binds to MGL-NP orincreased level of CA125^(MGL) as compared to a relevant control or apredetermined threshold value is indicative of the presence of EOC, orof a risk of EOC.

Comparison of the level of CA125 binding to MGL-NP or the level ofCA125^(MGL) in sample to be analysed with that of a relevant control ora predetermined threshold value may in some embodiments be performed bya processor of a computing device. Regardless of whether or not theprocessor of the computing device is used for said comparison, the levelof CA125 binding to MGL-NP or the amount of CA125^(MGL) is, at least insome embodiments, determined as “increased” or “higher” if the level ofCA125 binding to MGL-NP or the amount of CA125^(MGL) in the sample is,for instance, at least about 1.5 times, 1.75 times, 2 times, 3 times, 4times, 5 times, 6 times, 8 times, 9 times, 10 times, 20 times or 30times the predetermined threshold level, or the level of CA125 bindingto MGL-NP or the amount of CA125^(MGL) in the control sample. In someembodiments, the difference between the level of CA125 binding to MGL-NPor the amount of CA125^(MGL) in the sample to be analyzed and thepredetermined threshold level, or the level of CA125 binding to MGL-NPor the amount of CA125^(MGL) in the control sample has to bestatistically significant in order to provide a proper diagnostic,prognostic or predictive result. “Increased” concentration of HE4 orCA125 may be defined correspondingly, as is apparent to those skilled inthe art.

Concentration of CA125^(MGL), CA125 or HE4 in a sample obtained from asubject whose gynaecological disease state is to be determined or who isto be diagnosed, prognosed, or monitored for a gynaecological disease isconsidered “non-increased” or “normal” if the detected concentrationthereof is lower, essentially the same or essentially non-altered ascompared with that of a relevant control sample or a predeterminedthreshold value.

In some embodiments, the present method is particularly suitable forearly diagnosis of EOC and early detection of EOC relapse, recurrenceand progression. Likewise, CA125^(MGL) may serve as an early tumormarker for EOC as well as for EOC relapse, recurrence and/orprogression. Thus, the present method and CA125^(MGL) may be used notonly for diagnostic, prognostic and monitoring purposes but also forscreening of asymptomatic women for EOC or a risk of developing EOC.

The present disclosure also provides a kit for use in the present methodand its various embodiments. The kit comprises a CA125 binding agent,such as a monoclonal anti-CA125 antibody or mesothelin, and nanopartidesonto which MGL has been immobilized. Either said CA125 binding agent orMGL-NP comprises a detectable label, and may have been immobilized on asolid surface, such as a microtiter plate. Various details andembodiments of the present method apply also to the present kit, as isreadily understood by a skilled person. Thus, properties and features ofsuitable nanoparticles, for instance, are not repeated herein.

In some embodiments, said anti-CA125 antibody has been attached onto asolid surface, such as a microtiter plate. In some further embodiments,streptavidin coating of the plates and biotinylation of the antibody areused for said attaching. Alternative ways of achieving the same arereadily available for a skilled person.

Optionally, the kit may also comprise a control for comparing to ameasured value of CA125 binding to MGL-NP. In some embodiments, thecontrol is a threshold value for comparing to the measured value.

In some embodiments, the kit may further comprise one or more reagentsfor assaying CA125 and/or HE4 protein concentration. Non-limitingexamples of typical reagents for assaying CA125 protein concentrationinclude two CA125 bingeing agents, such as two monoclonal anti-CA125antibodies, which bind to different protein epitopes in CA125. One ofthe CA125 binding agents may be the same as the CA125 binding agentprovided for assaying CA125^(MGL). Non-limiting examples of typicalreagents for assaying HE4 protein concentration include two HE4 bingeingagents, such as two monoclonal anti-HE4 antibodies, which bind todifferent protein epitopes in HE4. One of the two CA125 or HE4 bindingagents may be immobilized on a solid surface while the other CA125 orHE4 binding agent may comprise a detectable label.

In some further embodiments, the kit may also comprise a computerreadable medium comprising computer-executable instructions forperforming any method of the present disclosure.

Embodiments of the kit which contain reagents for assaying samples forthe concentration of CA125^(MGL) and preferably also for CA125 and/orHE4 may also comprise reagents for assaying said samples for any otherbiomarker, especially for one or more biomarkers associated with anydisease other than EOC, endometriosis, or endometrial cancer, such asother gynaecological diseases or diseases associated with lowerabdominal pain. Thus, the kit may be used not only for diagnosing,prognosing, or monitoring EOC, endometriosis, and/or endometrial cancerbut also for diagnosing, prognosing, or monitoring, for example, othergynaecological diseases or other diseases associated with lowerabdominal pain, depending on the specificity and sensitivity of the oneor more other biomarkers whose concentrations are to be assayed.

Also provided are herein-disclosed nanoparticles comprising immobilizedMGL (MGL-NP); a composition comprising said MGL-NP; use of MGL, saidMGL-NP, or said composition for determining a state of a gynaecologicaldisease, especially a gynaecological disease selected from the groupconsisting of EPC, endometriosis, and endometrial cancer, in a subject;use of MGL, said MGL-NP, or said composition for diagnosing, prognosing,or monitoring a gynaecological disease in a subject; use of MGL, saidMGL-NP, or said composition for diagnosing, prognosing, or monitoringEOC in a subject; use of MGL, said MGL-NP, or said composition fordiagnosing, prognosing, or monitoring endometriosis in a subject; use ofMGL, said MGL-NP, or said composition for diagnosing, prognosing, ormonitoring endometrial cancer in a subject; use of MGL, said MGL-NP, orsaid composition for differential diagnostics of EOC, endometriosis, orendometrial cancer; use of MGL, said MGL-NP, or said composition fordifferentiating EOC, endometriosis, or endometrial cancer from otherdiseases associated with lower abdominal pain, such as colon cancer,ulcerative colitis, irritable bowel disease, irritable bowel syndromeand Crohn's disease. In some embodiments, said uses of MGL, said MGL-NP,or said composition may require concomitant use of reagents or methodsfor determination of HE4 and/or CA125 protein concentration to achievethe desired diagnostic or prognostic effect, or to enable monitoring theonset, progression, relapse, or recurrence of the disease in question,or response to treatment. Any details and applications disclosed withrespect to the present method and its embodiments apply to the varioususes of MGL-NP even though the details and applications are not repeatedherein.

It will be obvious to a person skilled in the art that, as technologyadvances, the inventive concept can be implemented in various ways. Theinvention and its embodiments are not limited to the examples describedbelow but may vary within the scope of the claims.

EXAMPLES Example 1: Materials and Methods

Origins of CA125 and Clinical Samples Purified CA125 from a primaryovarian carcinoma (OvCa) cell line, OVCAR-3, was obtained from FujirebioDiagnostics, Sweden. In the present experiments, said OVCAR-3-derivedCA125 antigen was used to represent malignant CA125 because it is theonly antigen studied in detail (cloning, glycosylation, interactions).

All biological samples were provided by Department of Pathology,University of Turku, Finland with appropriate permissions and informedconsents in accordance with the ethical guidelines of the HospitalDistrict of Southwest Finland.

Initially, normal amniotic fluid and placental homogenate supernatantwere used as non-malignant (i.e. normal) sources of CA125. Later,ascites fluids of liver cirrhosis patients (LC) and immature teratoma(germ line ovary cancer different from EOC; IT) were included asadditional sources of CA125. The content of CA125 in each sample wasdetermined by a conventional CA125 immunoassay using purified OVCAR-3derived CA125 as a standard.

Archived serum samples (n=401) with four different clinical statuses asindicated in Table 1 were also employed.

TABLE 1 Clinical serum samples Number of serum samples Clinical status(n = 401) Epithelial ovarian cancer, sequen- 213  tial samples of 68patients Endometriosis (Stage 1-2 and 3-4) 121 (Stage 1-2 = 33; Stage3-4 = 88) Healthy Control 51 Endometrial Cancer 16

Anti-CA125 Antibodies

Three different monoclonal anti-CA125 antibodies, namely Ov185, Ov197and OvK95, which detect different protein epitopes of CA125 wereobtained from Fujirebio Diagnostics (Göteborg, Sweden).

For use as tracers, the antibodies were labelled with Eu³ chelates usingstandard protocols known in the art.

For use as solid-phase capture agents, the antibodies were biotinylatedfor 4 h at room temperature (RT) with a 40-fold molar excess of biotinisothiocyanate using a standard procedure known in the art. Thebiotinylated antibodies were purified with NAP-5 and NAP-10gel-filtration columns (GE Healthcare, Schenectady, N.Y., USA) by using50 mmol/L Tris-HCl (pH 7.75), containing 150 mmol/L NaCl and 0.5 g/LNaN₃. The labelled antibodies were stabilized with 1 g/L BSA (Bioreba,Nyon, Switzerland) and stored at +4° C.

Lectins

A panel of plant lectins was purchased from VECTOR lab and two humanlectins, namely MGL and DC-SIGN, were provided by VU University MedicalCenter Amsterdam, the Netherlands. The extracellular part of MGL wasamplified on pRc/CMV-MGL with PCR, confirmed by sequence analysis andfused at the C-terminus to human IgG1-Fc in the Sig-plgG1-Fc vector.MGL-Fc was produced by transient transfection of CHO cells. In thepresent examples, MGL-Fc is referred to as MGL.

TABLE 2 Lectins employed in the present experiments Major carbohydrateLectin name binding specificity SBA (Soy bean agglutinin) GalNAcα1-Ser/Thr SNA (Sambucus Nigra agglutinin) sialic acid α2,6Gal/GalNAcPNA (Peanut agglutinin) Galβ1,3GalNAc α1-Ser/Thr MAA (Maackia amurensislectin I) sialic acid α2,3Gal β1,4GlcAc AAL (Aleuria aurantiaagglutinin) Fuc α1,6 GlaNAc UEA (Ulex europeus agglutinin) Fuc α1,2 GlaPHA-E (Phaseolus vulgaris agglutinin- GalNAc β1,4 linked to β-mannosylresidue of the trimannosyl core erythroagglutinin) RCA (Ricinus communisagglutinin) Gal β1,4GlcNAc WGA (Wheat germ agglutinin) GlcNAc β 1,4GlcNAc WFA (Wisteria floribunda agglutinin) GAINAc α or β- 3 or 6position of galactose PSA (Pisum sativum agglutinin) Mannose αN-acetylchitobiose-linked α- fucose VVL (Vicia villosa lectin) α- orβ-GalNAc linked to serine or threo- nine in a polypeptide (Tn antigen)TJA-II (Trichosanthes japonica agglutinin) Fuc α 1-2Gal and β-GalNAc MGL(macrophage galactose lectin) GalNAc linked to serine or threonine in apolypeptide (Tn antigen) DC-SIGN Nonsialylated Lewis antigen

Lectins were either labelled with N1 europium chelates or immobilizedonto europium chelate-doped, monodisperse, carboxyl-modified FluoroMax™polystyrene nanoparticles (107 nm in diameter, carboxyl content 0.157mEq/g, parking area 56.6 Å²) which were obtained from Thermo ScientificSeradyn Inc., Indianapolis, Ind.). The nanoparticles employed produce along-lifetime fluorescence equivalent to 30,000 chelated ions perparticle.

Primary amino groups of lectins were covalently coupled to activatedcarboxyl groups of the nanoparticles using a procedure describedpreviously with some minor modifications (Soukka et al., Anal. Chem.2001, 73, 2254-2260). The nanopartides (1e10¹² particles) were suspendedin 10 mmol/L phosphate buffer (pH 7.0), and their surfaces wereactivated with 0.75 mmol/L N-(3-dimethylaminopropyl)-N-ethylcarbodiimide(Sigma-Aldrich, St. Louis, Mo., USA) and 10 mmol/LN-hydroxysulfosuccinimide sodium salt (Sigma-Aldrich). Theconcentrations of lectins in the coupling reactions were 0.625 mg/ml,and the reactions contained 100 m mol/L NaCl. The activated particleswere mixed with the lectins. The coupling reactions were incubated for 2h at +23° C. with vigorous shaking. Final washes and blocking of theremaining active groups were performed in Tris-based buffer (10 mmol/LTris, 0.5 g/L NaN₃, pH 8.5), and the nanopartide-lectin conjugates werestored in the same buffer supplemented with 2 g/L BSA at 4° C. Beforethe first instance of use, the particles were mixed thoroughly,sonicated, and centrifuged lightly (350 g, 5 min) to separatenon-colloidal aggregates from the monodisperse suspension.

CA125 Assays

Red assay buffer, wash buffer and streptavidin-coated low-fluorescencemicrotiter plates used in these experiments were purchased from KaivogenOy, Turku, Finland.

Biotinylated solid-phase antibodies (200 ng) were immobilized ontostreptavidin-coated microtiter wells in 100 μL of the assay buffer.After 1 h incubation at RT and shaking at 900 rpm, the wells were washedtwo times with the wash solution and used immediately in the assays.

Next, 50 μl of diluted samples (1:5 in assay buffer) were added to eachwell, and incubated for 1 h at RT with shaking. CA125 antigens ofdifferent origins thereby captured on the wells were used in threedifferent time-resolved fluorescence (TRF) assay formats with threedifferent Eu³⁺-labelled tracers, namely Ov185-Eu³⁺ mAb for detecting theprotein epitope of CA125, and either various Eu³⁺-labelled lectins orEu³⁺-labelled lectin-nanoparticles for detecting the glycan epitope ofCA125.

For detecting solid-phase-captured CA125 in a conventional CA125immunoassay (Example 2), 200 μl of assay buffer containing 25 ng ofOv185-Eu³⁺ mAb was added to each well, and incubated for 1 h at RT withshaking. Time-resolved fluorescence for europium was measured (lex: 340nm; lem: 615 nm) after adding enhancement solution for 10 min RT withshaking at 900 rpm using Victor3V 1420 Multilabel counter.

For detecting solid-phase-captured CA125 in an anti-CA125antibody-lectin sandwich assay (Example 3), 200 μl assay buffercontaining 25 ng of Eu+3-lectin was added to each well, and incubatedfor 1 h at RT with shaking. Time-resolved fluorescence for europium wasmeasured (lex: 340 nm; lem: 615 nm) after adding enhancement solutionfor 10 min RT with shaking at 900 rpm using Victor3V 1420 Multilabelcounter.

For detecting solid-phase-captured CA125 in an anti-CA125antibody-lectin nanopartide sandwich assay (Example 4), 100 μl of assaybuffer containing 5e6 Eu³⁺-NPs coated with various lectins, withadditional 6 mM CaCl₂ for CLR (DC-SIGN, MGL), was added to each well andincubated for 2 h at RT with shaking. After the incubation, the wellswere washed 6 times with the wash buffer. Time-resolved fluorescence foreuropium was measured (lex: 340 nm; lem: 615 nm) from dry wells usingVictor3V 1420 Multilabel counter.

HE4 and CA125 Assays for Clinical Serum Samples

Human epididymis protein (HE4) and CA125 protein concentrations wereanalyzed in serum samples by ELISA analysis (Fujirebio Diagnostics Inc.,Malvem, Pa., USA) according to manufacturers instructions.

Example 2: Conventional CA125 Immunoassay

A combination of biotinylated Ov197 mAb (as a capture antibody for CA125on streptavidin plates) and Eu³⁺-labelled Ov185 mAb (as a tracerantibody) were used in a DELFIA® time resolved fluorescence (TRF)immunoassay. The mAbs used detect different protein epitopes on CA125.The basic principle of this conventional CA125 immunoassay isillustrated in FIG. 1A, while experimental details are given in Example1.

First, three different CA125-containing samples, namely OVCAR-3-derivedpurified CA125, amniotic fluid (AF), and placental homogenate (Pla) wereassayed as set forth above.

The results showed that CA125 of different origins gave almost similarnet signals indicating that the amount of CA125 protein in each samplewas almost the same (FIG. 2). Thus, the conventional CA125 immunoassaycannot be used for discriminating malignant CA125 from normal CA125.

Next, the above results were verified in a larger dynamic range withanother set of origins of CA125. To this end, CA125 of four differentorigins, i.e. cancerous CA125 from OVCAR-3 cell line and normal/benignCA125 from placental homogenate (Pla) and two ascites of liver cirrhosis(LC) and immature teratoma (IT), were applied on the Ov197 plates in anamount ranging from 5 to 2000 U/ml with the exception of IT-CA125 whichwas used in an amount ranging from 5 to 1000 U/ml. Ov185 was used as atracer for detecting the binding of CA125 of different origins to Ov197.These results confirmed that the conventional CA125 immunoassay cannotbe used for discriminating CA125 of different origins from each other(FIG. 3).

Example 3: Anti-CA125 Antibody-Lectin Sandwich Assay

In these experiments, CA125 of three different origins were used inamounts ranging from 10 to 100 U/ml in TSA-BSA 1%. CA125 was captured onthe biotinylated Ov185 anti-CA125 antibody. A panel of Eu³′-labelledplant as well as human lectins were used as tracers as shownschematically in FIG. 1B and described in detail in Example 1. Mostreactions showed high backgrounds in relation to the predominantly lowspecific signals.

FIG. 4 shows that none of the lectins employed was able to discriminatebetween non-malignant CA125 and EOC-derived CA125. The lowest backgroundwas obtained with MGL but the net signals from the reactions with CA125were very poor. Background signals for each of the lectins employed areshown in Table 3 below.

TABLE 3 Background signals Lectin Eu-chelates (counts) WFA 2066 PHA E1918 PNA 50479 MGL 248 SNA 844 MALII 5624 AAL 11747

On the other hand, AAL (lectin from mushroom Aleuria amantia) was ableto react with amniotic fluid-derived CA125 but not with cancerous orplacental CA125. In order to test whether or not AAL could be used foridentifying benign CA125 in patients with endometriosis, four clinicalserum samples, two from patients with EOC and two from patients withendometriosis, were employed. As shown in FIG. 5, AAL cannot be used fordiscriminating EOC-derived CA125 from endometriosis-derived CA125. Fabfractions of the capturing antibodies were used in an attempt to reducethe background signals but no significant improvement was achieved.

Example 4: Anti-CA125 Antibody-Lectin Nanoparticle Sandwich Assay

Since the direct Eu-chelate labelling of lectins gave no discriminationbetween different origins of CA125, lectins were immobilized ontoEu³⁺-doped nanoparticles as described in Example 1 in order to improvefunctional affinity (avidity effect). Two features of the nanoparticles,in particular, were noticed to contribute to the improvement of theresults: 1) signal amplification provided by 30,000 chelates in a 107 nmparticle, and 2) the strengthening of the functional affinity of thelectins to their target epitopes through the avidity effect provided bythe high density of immobilized lectins on the particle.

In these experiments, four different sources of CA125 were used, namelypurified OVCAR-3 derived CA125 (150900 U/ml), placental homogenate(Pla), ascites fluid of liver cirrhosis (LC), and ascites fluid ofimmature teratoma (IT). Next, 5 to 100 U/ml of CA125 from all fourdifferent sources spiked in TSA-BSA were assayed using anantibody-lectin nanoparticle sandwich assay. Biotinylated Ov185 mAb wasused as a capturing antibody, while Eu chelate doped nanoparticlesloaded with several different plant lectins, namely WGA, WFA, SNA, PHAE,SBA, AAL, UEA, MAA, RCA, PSA, WL, TJA or PNA, or human C-type lectinreceptors (CLR), namely MGL and DC-SIGN, were used as tracers.

As shown in FIG. 6, only human lectin MGL nanoparticles showed enhancedspecificity for the EOC-derived CA125. The net signal with EOC-derivedCA125 was 10- to 12-fold higher than with placental homogenate-derivedCA125 (Pla-CA125). Negligible net signal was obtained with livercirrhosis-derived CA125 (LC-CA125) and with immature teratoma-derivedCA125 (IT-CA125). Background signals for each of the lectins employedare shown in Table 4 below.

TABLE 4 Background signals Lectin coated on Eu-NP (counts) MGL 217DC-SIGN 416 PHA-E 30044 SBA 128 WGA 4230 SNA 758 PNA 959 WFA 4369 PSA1642 VVL 6659 RCA 359 TJA 834 MAA 3796

WGA showed four times more net signals with LC-125 and IT-CA125 thanwith EOC-derived or placental CA125, while SNA, PHA-E, PNA, WL andDC-SIGN showed reactivity with only placental CA125 (FIG. 6). Theresults indicate that none of these lectins are suitable fordiscriminating EOC-related CA125 from normal or benign CA125.

Next, all three anti-CA125 mAbs (Ov185, Ov197 and OvK95) were comparedas capturing agents for CA125 in the MGL nanoparticle assay. Ov185 gavethe highest net signals as well as signal/background (S/B) ratio with avery good discrimination between OvCa-derived and normal/benign CA125antigen. The analytical detection limit was estimated to be less than <5U/ml for OvCa-derived CA125 (FIG. 7).

No hook effect was observed even very high concentrations of CA125 wereused in the MGL-NP assay (FIG. 8). This is an important resultindicating that no false negative results are to be obtained withpresent method due to very high concentrations of CA125 in a sample tobe analysed.

Example 5: Suitability of Blood Samples for Anti-CA125 Antibody-LectinNanoparticle Sandwich Assay

After the good separation of OvCa-derived CA125 from CA125 of otherorigins with the present MGL-Fc NP-assay in simple matrices/buffer(TSA-BSA 1%), the recovery value of the same in complex matrices likehuman serum/plasma was determined. For this purpose, 5 to 100 U/ml ofCA125 from different origins were spiked in parallel in either healthymale pooled plasma or in simple buffer (TSA-BSA 1%) and captured onbiotinylated Ov185 mAb on streptavidin microtiter plates and, afterwashing, finally traced with MGL-Fc NPs to see the recovery rate.Excellent recovery of almost 95 to 110% was achieved indicating that theinherent plasma components do not interfere with the present MGL-Fcnanoparticle assay (FIG. 9).

Example 6: Analyses of Clinical Samples

In order to test whether or not the results obtained with OVACAR-3 cellline-based CA125 antigen could be translated into clinical context, asmall cohort of clinical samples was analysed side by side with thepresent MGL-NP assay and the conventional CA125 immunoassay. The cohortincluded serum samples of patients with EOC (n=12) and healthy pregnantwomen (n=2) as wells as pooled serum samples of patients withendometriosis (n=2). Signal ratios obtained with the two methods clearlyindicated that clinical EOC samples can indeed be distinguished fromclinical endometriosis samples (FIG. 10).

In order to validate the results in a larger cohort and to compare thediagnostic power of CA125^(MGL) to conventional CA125 protein marker andHE4, a number of archived clinical serum samples (n=401) were employed.Serum concentrations of HE4, CA125 protein, and CA125^(MGL) wereassessed in 213 sequential samples of 68 ovarian cancer patients werecompared with results obtained in 121 patients with endometriosis, 16patients with endometrial cancer and 51 healthy women as controls (Table1). All EOC cases were from advanced stages of the disease but 43 serumsamples from 32 individual EOC cases belonged to a progression/relapsestage of the disease. These progression/relapse serum samples (n=43)were considered as mimics of the early stages of the disease and,therefore, were treated as a separate group of the clinical samples insome of the analyses performed.

Box Plot Analyses

Box Plot analyses of five different groups of clinical samples (healthycontrol n=51, endometriosis stages 1-2 n=33, endometriosis stages 3-4n=88, EOC progression/relapse cases n=43 and endometrial cancer n=16)with respect to their HE4 protein content, CA125 protein content(conventional) and CA125^(MGL) glycoform content are shown in FIGS. 11Ato 11C. According to the results, HE4 content was elevated in the EOCgroup and, to a lesser extent, also in the group of endometrial cancers.The conventional CA125 protein content was elevated in the EOCprogression/relapse group as compared with the groups of healthycontrols and endometrial cancers, but the CA125 protein content wasoverlapping with the group of endometriosis stages 3-4. CA125^(MG)content, in turn, was elevated only in the EOC progression/relapse groupas compared with all the other groups. Together these results indicatethat of the markers studied only CA125^(MGL) can be successfully usedfor distinguishing clinical EOC cases from the other case groups.

In another series of Box Plot analyses, the CA125^(MGL) assay wasapplied to the analysis of serum samples from the healthy individuals(n=51), and the endometriosis (n=121) and high-grade serous EOC patients(n=21) and compared them with the conventional CA125 immunoassay values.The median preoperative CA125 values in serum samples of healthycontrols, endometriosis patients and EOC patients were 6.4, 24.9 and 700U/ml, respectively (FIG. 12A), showing significantly elevatedconcentrations both in endometriosis and EOC as compared with healthycontrols. In contrast, median preoperative CA125^(MGL) values (FIG. 12B)did not significantly differ between healthy controls (0.486 U/ml) andendometriosis patients (0.841 U/ml; p=0.073). In EOC group the medianCA125^(MGL) was 37.93 U/ml being 45-times higher than in endometriosis.Further, serum samples from endometriosis (n=44) and EOC (n=38) patientswith marginally elevated CA125 values (35-200 U/ml) were studied toevaluate the discrimination between malignant and benign conditions byconventional CA125 immunoassay and CA125^(MGL) assay (FIGS. 12C and12D). As evidenced by FIG. 12D, the CA125^(MGL) assay providedsignificantly higher (6.1 fold, p-value <0.001) levels in the EOC serumsamples as compared with those measured in the endometriosis patients.On the other hand, the difference between healthy controls andendometriosis patients was reduced significantly. A 8.3-fold (p<0.001)difference was observed with the conventional assay, while a 2.5-folddifference still reaching significance (p=0.005) was observed with theCA125^(MGL) assay.

ROC Curve and AUC Analyses

ROC curve analyses for discriminating endometriosis (n=121) from eitherall sequential EOC cases (n=213), progression/relapse EOC cases (n=43),or advance pre-operative EOC cases (n=29) were performed with respect toHE4, CA125, and CA125^(MGL) either alone or in combination. The ROCcurves are shown in FIGS. 13A to 13C, while the obtained AUC values aresummarized below.

TABLE 5 AUC values obtained from ROC analysis performed fordiscriminating endometriosis (n = 121) from all sequential EOC cases (n= 213) Marker AUC HE4 0.876 CA125 0.776 CA125^(MGL) 0.815 Combination ofall three markers 0.899

TABLE 6 AUC values obtained from ROC analysis performed fordiscriminating endometriosis (n = 121) from progression/relapse EOCcases (n = 43) Marker AUC HE4 0.928 CA125 0.759 CA125^(MGL) 0.870Combination of all three markers 0.947

TABLE 7 AUC values obtained from ROC analysis performed fordiscriminating endometriosis (n = 121) from pre-operative EOC cases (n =29) Marker AUC HE4 0.941 CA125 0.959 CA125^(MGL) 0.889 Combination ofall three markers 0.967

In the first two analyses, the AUC value for HE4 was higher than forCA125 or CA125^(MGL) because of the negligible false positivity inendometriosis with HE4 (FP=2.5%). Corresponding FP values for CA125 andCA125^(MGL) in endometriosis are 37.2% and 7.4%, respectively.

In the last analysis, which concerned pre-operative serum samples, i.e.samples representing advanced stages of EOC, the AUC value for CA125 wasthe highest. This result is in accordance with the known diagnosticvalue of CA125 particularly in advanced EOC.

In each AUC analysis, the AUC value obtained with a combination of allthree markers was higher than that of any individual marker.

Assessment of Success Rates

Success rates for markers HE4, CA125, and CA125^(MGL) either alone or inpaired combinations were determined regarding the disease group ofprogression/relapse cases (n=32, the first sequential sample from eachindividual progression/relapse patient). Each serum sample wasclassified either as negative or positive for each marker using thefollowing cut-off values: 35 IU/ml for CA125, 70 pM for HE4, and 2 IU/mlfor CA125^(MG).

TABLE SERIES 8 Distribution of serum samples (n = 32) on the basis oftheir marker positivity or negativity HE4 CA125 HE4 CA125 + −CA125^(MGL) + − CA125^(MGL) + − + 13 7 + 17 6 + 14 9 −  8 4 −  3 6 −  72 No. positive (%) No. positive (%) No. positive (%) HE4 21 (65.6) — 21(65.6) CA125 20 (62.5) 20 (62.5) — CA125^(MGL) — 23 (71.9) 23 (71.9)Combination 28 (87.5) 26 (81.2) 30 (93.7)

These results indicate that the success rate of CA125^(MGL) foridentifying early EOC cases as afflicted individuals may be improvedfrom 71.9% to 81.2% and further to 93.7% when used in combination withCA125 and HE4, respectively.

Longitudinal Analyses

Relative concentration changes (concentration/cut-off) of HE4, CA125,and CA125^(MGL) in sequential serum samples from EOC cases underprogression of the disease (n=29) were determined. All patients weretreated for disseminated disease with surgery and chemotherapy and wereunder surveillance for disease progression. All patients had asignificant initial treatment response as judged by both reduction ofCA125 values and radiologic response criteria but experienced a verifieddisease progression during follow-up. Samples with low positive levelswere included, but high preoperative/early treatment phases wereexcluded from the analysis. Cut-off values used HE4, CA125, andCA125^(MGL) were 70 pM, 35 U/ml, and 2 U/ml, respectively.

The results showed that in 69% of the cases (20/29) the level ofCA125^(MGL) was increased stronger than the other two markers uponprogression of the disease. Furthermore, CA125^(MGL) displayed earlierincrease than HE4 and CA125 in 31% of the cases (9/29). Thus, clinicianscould be alarmed much earlier of a possible relapse if CA125^(MGL) wasused to monitor patients under treatment for EOC. The medianconcentration of CA125^(MGL) in samples obtained at or just before EOCprogression was 7.97 U/ml. Some examples of the longitudinal analysesperformed are shown in FIG. 14.

Example 7: Effect of Hormonal Status on Serum Levels of CA125^(MGL)

Serum samples of healthy premenopausal women and women withendometriosis analysed earlier for CA125 and HE4 (Hallamaa et al.,Gynecol. Oncol., 2012, 125:667-672) were now assayed for CA125^(MGL) bythe present MGL-NP assay. Results show that both CA125^(MGL) and HE4assays can be carried out at any phase of the menstrual cycle andirrespective of hormonal medication without distortion of the results(FIGS. 15A and 15C, respectively). This finding extends theapplicability of these two markers in clinical practice. On the otherhand, the conventional CA125 assay showed significant differencesbetween different stages of the menstrual cycle (FIG. 15B).

1. A kit for a CA125-binding agent-lectin-sandwich assay, comprising: aCA125-binding agent, and MGL, wherein either said CA125-binding agent orsaid MGL comprises a detectable label.
 2. The kit according to claim 1,wherein the kit is for an assay for determining a gynaecological diseasestate in a subject, wherein the gynaecological disease is selected fromthe group consisting of epithelial ovarian cancer (EOC), endometriosis,and endometrial cancer.
 3. The kit according to claim 1, wherein saidMGL is a nanoparticle-immobilized MGL (MGL-NP), or wherein the kitfurther comprises nanoparticles for immobilizing said MGL.
 4. The kitaccording to claim 1, wherein said CA125-binding agent is a monoclonalanti-CA125 antibody or mesothelium.
 5. The kit according to claim 1,wherein said CA125-binding agent is bound to a solid surface, or a solidsubstrate selected from glass, silica, aluminosilicates, borosilicates,metal oxides, gold, clay, nitrocellulose and nylon.
 6. The kit of claim1, wherein said CA125-binding agent is bound to a microtiter plate, orwherein the kit further comprises a microtiter plate for binding saidCA125-binding agent.
 7. The kit according to claim 1, further comprisinga control sample for comparing to the measured value of CA125 binding toMGL.
 8. The kit according to claim 1, further comprising one or morereagents for assaying CA125 protein concentration.
 9. The kit accordingto claim 1, further comprising a control sample for comparing to themeasured value of HE4 concentration.
 10. The kit according to claim 1,further comprising one or more reagents for assaying HE4 concentration.11. The kit according to claim 3, wherein all the dimensions of saidnanoparticle are less than about 1000 nm, about 500 nm or less, about100 nm or less, or about 50 nm or less.
 12. The kit according to claim3, wherein said nanoparticle is selected from the group consisting ofprotein nanoparticles, mineral nanoparticles, glass nanoparticles,nanoparticle crystals, metal nanoparticles, plastic nanoparticles,polystyrene nanoparticles, poly(ethylene glycol) nanoparticles,polyethylene nanoparticles, poly(acrylic acid) nanoparticles,poly(methyl methacrylate) nanoparticles, polysaccharide nanoparticles,colloidal gold nanoparticles, silver nanoparticles, quantum dots, carbonnanoparticles, porous silica nanoparticles, and liposomes.
 13. The kitaccording to claim 3, wherein the nanoparticles are directly orindirectly qualitatively or quantitatively detectable.
 14. The kitaccording to claim 3, wherein the nanoparticles are upconvertingnanoparticles (UCNP), or resonance particles.
 15. The kit according toclaim 3, wherein the nanoparticles are upconverting phosphorus (UCP)particles.
 16. The kit according to claim 3, wherein the nanoparticlesare detectable by fluorescent labels, bioluminescent labels, orchemiluminescent labels.
 17. The kit according to claim 3, wherein saidnanoparticle is doped with a lanthanide chelate.
 18. The kit accordingto claim 3, wherein said nanoparticle is doped with luminescentlanthanide ions with luminescence emission in visible or near-infraredor infrared wavelengths and long fluorescence decay.
 19. The kitaccording to claim 3, wherein said nanoparticle is doped with one ormore of europium (III), terbium (III), samarium (III), dysprosium (III),ytterbium (III), erbium (III) and neodynium (III).
 20. The kit accordingto claim 3, wherein said nanoparticle is doped with europium(III). 21.The kit according to claim 1, wherein the kit further comprises acomputer readable medium comprising computer-executable instructions forperforming said assay.
 22. The kit according to claim 1, wherein the kitfurther comprises agents for assaying one or more biomarkers associatedwith diseases associated with lower abdominal pain.